[U2Lynne]

An md5 file is used to verify that other files where downloaded properly. In this case, since you downloaded a DVD, it is probably used to verify the contents of a VIDEO_TS folder. It is the VIDEO_TS folder that you want to burn to DVD, not the md5 file. I'm not familiar with Nero (I'm on a Mac), but I think I've read that you open it, select Burn Video DVD and then that should open a window that shows both a VIDEO_TS folder and an AUDIO_TS folder. At that point, you drag the contents of your downloaded VIDEO_TS folder into the Nero VIDEO_TS folder and hit burn. If that doesn't make sense, post back and someone who actually uses Nero to burn can come and do a better job of explaining it than I.